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Registered since

Apr 6, 2020

acoustimass 10 subwoofer hums and buzzes

When I turn my Onkyo receiver off my sub unit buzzes.

The only thing connected to the amp is the sub and, the speakers which is part of the Bose 10 system.

I have tried moving the power plug from the extension lead and switched it directly into the wall and its the same hum / buzz.

Is this a faulty sub unit or receiver? Any help would be greatly appreciated.